Parametric analysis of the transmission dynamics during indigenous aggregated outbreaks caused by five SARS-CoV-2 strains in Nanjing, China.

Notably, the incubation period and SI of the five had both a progressive shortening trend ( p < 0.001); Moreover, R 0 of the five were 2.39 (95% CI: 1.30–4.29), 3.73 (95% CI: 2.66–5.15), 5.28 (95% CI: 3.52–8.10), 5.54 (95% CI: 2.69–11.17), 7.39 (95% CI: 2.97–18.76), with an increasing trend gradually ( p < 0.01); HSAR of the five were 25.5% (95% CI: 20.1–31.7%), 27.4% (95% CI: 22.0–33.4%), 42.9% (95% CI: 34.3–51.8%), 53.1% (95% CI: 45.0–60.9%), 41.4% (95% CI, 25.5–59.3%), also with an increasing trend ( p < 0.001).

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The results showed that the median SI of the five strains that caused the six aggregated outbreaks in Nanjing were 5.69, 4.79, 2.70, 2.12, and 2.43 days, respectively, which showed a trend of gradual shortening, and all of them were lower than that of the initial outbreak in Wuhan (7.5 days) ( 21 ).

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